4
Installation, Operation and Maintenance Manual
May 2021
DOC.IOM.BRX.EN Rev. 2
Standard Installation
Section 3: Standard Installation
Section 3: Standard Installation
This Section explains how to install the Bettis RPX actuators in most comon applications like:
•
"In-line" installation on quarter turn valves.
•
"Transverse" (a.k.a. across line) installation on quarter turn valves.
The RPX Actuator can be used for butterfly valves, ball valves and all quarter turn devices,
in Double-Acting or Spring-Return configuration. Single-Acting Actuators are supplied
as FAIL - CLOSE (CW) as standard. Reverse acting (FAIL - OPEN; CCW) must be specified at
the time of order. Alternatively, it is possible to change an actuator from FAIL - CLOSE to
FAIL - OPEN by a trained and certified mechanical engineer using the assembly/disassembly
instructions as described in this document.
These installation instructions assume that the actuator is installed with the cylinder axis
parallel to the axis of the valve bore ("In-line" mounting). Please ensure that you have an
actuator with the correct drive, and that the valve and actuator are in the following positions:
1.
Double-Acting units and Spring-Return units in FAIL - CLOSE position: valve closed,
actuator fully clockwise.
2.
Double-Acting units and Spring-Return units in FAIL - OPEN position: valve open,
actuator fully counterclockwise.
3.1
Butterfly Valve Application
Mounting to butterfly valves:
1.
Screw the actuator mounting studs tightly into the actuator base.
2.
Install the correct shaft adapter if required.
3.
Mount the actuator onto the valve top flange and secure using a lock washer
and nut on each mounting stud.
3.2
Ball Valve Application
Mounting to ball and high performance butterfly valves using a bracket:
1.
Screw the actuator mounting studs tightly into the actuator base and secure
the mounting bracket to the underside of the actuator using four nuts and
washers as shown in Figure 1.
2.
Install the appropriate coupling onto the valve stem. The coupling should
be lightly tapped or pressed onto the valve stem. The use of a lubricant
is recommended.
3.
Mount the actuator and bracket onto the valve top flange using the
appropriate bolts.
